Question about GMC Denali

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1999 GMC Denali heater blower motor is always on high. The only way to stop it, while the vehicle is running, is to pull the 25A fuse. The switch does nothing, even in the "off" position.

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Hi,Sounds like your resister for your blower motor is shorted. this is mounted under the passenger side of the heater box where the blower motor is. This resister board has a reley mounted on it for high speed operation. very easy to change around 40 bucks at auto zone.

Posted on Aug 25, 2010

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On 2004 pontiac montana what does fuse 7 control


7-BATT MAIN 1
60A
Fuses: •
CIGAR/DLC/APO FRT
• CLUSTER BATT
• CTSY LAMP
• ON STAR
• PWR LOCK
• PWR MIRROR
• RAP RELAY
• RR PWR SCKT

look below for above listed componet's , pull those fuse's one at a time till arc stop's ,then you found your problem circuit . Do you know where the I/P fuse box is ?
Fuse Block- I/P
Right side of the I/P, in the right front door opening


Fuse Block-I/P Label
Fuse Block-I/P Application Table Fuse/Circuit Breaker
Rating
Description
BCM PRGRM
10A
Body Control Module (BCM)
ENHANCED EVAP/AWD
15A
Evaporative Emission (EVAP) Canister Vent Solenoid, Clutch Pump Check Valve
CIGAR/DLC/APO FRT
20A
Auxiliary Power Outlet-Front, Cigar Lighter, Data Link Connector (DLC)
CLUSTER/BATT
10A
Instrument Panel Cluster (IPC)
CRUISE
10A
Cruise Control Module (CCM), Cruise Control Release Switch, Cruise Control ON/OFF Switch
CTSY LAMP
10A
Body Control Module (BCM)
DRL
10A
Daytime Running Lamps (DRL) Control Module
HVAC/DIC/DRL/HEATED SEAT
10A
Air Temperature Actuator-Left, Air Temperature Actuator-Right, Daytime Running Lamps (DRL) Control Module, Driver Information Center (DIC), Mode Actuator, Rear Window Wiper/Washer and Multifunction Switch (Heated Seat Switch), Recirculation Actuator, Relay Block (Rear Window Defogger Relay)
ELC/TRAILER
25A
Auto Level Control (ALC) Air Compressor, Auto Level Control (ALC) Air Inflator Relay, Auto Level Control (ALC) Sensor
FRT HVAC HI BLWR
30A
Blower Motor Resistor Assembly
FRT WPR/WSHR
25A
Windshield Wiper Motor, Windshield Wiper/Washer Switch
HAZARD
15A
Turn Signal/Multifunction Switch
HEADLAMP
20A
Daytime Running Lamps (DRL) Control Module, Headlamp Dimmer Switch, Headlamp Switch
HTD MIRROR
10A
Outside Rearview Mirrors-Left, Right
HVAC/BLOWER
25A
HVAC Control Module
IGN1
10A
Body Control Module (BCM), Instrument Panel Cluster (IPC), Left Rear Side Door Actuator Control Module, Rear Object Sensor Control Module, Right Rear Side Door Actuator Control Module, Stop Lamp Switch
LH HEADLP HIGH
10A
Headlamp High Beam-Left
LH HEADLP LOW
10A
Headlamp Low Beam-Left
LH T/LP
10A
Tail Lamp-Left, Trailer Rear Wiring Harness
MALL/CLUSTER
10A
Body Control Module (BCM), Instrument Panel Cluster (IPC)
ON STAR
5A
Vehicle Interface Unit (VIU)
PASS KEY
10A
Theft Deterrent Control Module
PCM/ABS
10A
Electronic Brake Control Module (EBCM), Fuse Block-Underhood, Powertrain Control Module (PCM), Park/Neutral Position (PNP) Switch
PCM/CRANK
10A
Powertrain Control Module (PCM)
PCM/PASS KEY/CLUSTER
10A
Instrument Panel Cluster (IPC), Powertrain Control Module (PCM), Theft Deterrent Control Module, Instrument Panel Cluster (IPC), Powertrain Control Module (PCM)
PWR LOCK
20A
Body Control Module (BCM)
PWR MIRROR
10A
Outside Rearview Mirror Switch
PWR QTR VENT
10A
Auto Level Control (ALC) Air Compressor, Auto Level Control (ALC) Sensor, Rear Quarter Window Switch
PWR/HEATED SEAT PSD
30A
Driver Seat Assembly, Passenger Seat Assembly
PWR SLDG DR
30A
Left Rear Side Door Actuator Control Module, Right Rear Side Door Actuator Control Module
PWR WDO
30A
Window Switch-Driver, Window Switch-Front Passenger
RAP RELAY
10A
Relay Block (RAP Relay)
RH HEADLP HIGH
10A
Headlamp High Beam-Right
RH HEADLP LOW
10A
Headlamp Low Beam-Right
RR HVAC/TEMP CONT
25A
Air Temperature Actuator-Auxiliary, Blower Motor-Auxiliary, Blower Motor Relay-Auxiliary, HVAC Control Assembly-Auxiliary, Mode Actuator-Auxiliary
RR DEFOG/ HTD MIRROR
30A
Window Defogger Relay-Rear
RR FOG LP
10A
Fog Lamp Relay-Rear
RR PWR SCKT
20A
Auxiliary Power Outlet-Rear
RH T/LP
10A
Tail Lamp-Right, Trailer Rear Wiring Harness
RR WPR/WSHR
20A
Window Wiper Motor-Rear, Rear Window Wiper/Washer and Multifunction Switch
SIR
15A
Inflatable Restraint Sensing and Diagnostic Module (SDM)
STOP LAMP
15A
Stop Lamp Switch
SWC BACKLIGHT
2A
Steering Wheel Controls-Left, Right
T/SIG
10A
Turn Signal Switch and Backup Lamp Relay

Jan 09, 2018 | Pontiac Cars & Trucks

1 Answer

I need to pull the fuse for the blower motor on a 1997 GMC 1500 Pickup


The "A/C" Fuse, a 25A fuse, controls the A/C and Blower Relays. Pulling this will remove power to the blower motor.

Jan 10, 2015 | GMC C1500 Cars & Trucks

1 Answer

I only have high and off on my heater control switch


CHECK THE BLOWER MOTOR RESISTOR. ITS ON THE EVAP BOX,UNDER THE DASH. NOT A HARD FIX, MIGHT HAVE TO REMOVE GLOVE BOX

Dec 17, 2014 | 1999 GMC Yukon Denali

1 Answer

I have a 1999 GMC Suburban and the heater switch only works on high. Originally the heater fan did not work at all and then one cold morning I tried the switch and heard a loud clanking noise from the fan...


I'm 99% sure it is the blower motor resistor - common problem. Pull the panel off the passenger
side under the glove compartment. You'll see the blower assembly on the right side with a multi
colored wiring harness going to it. Disconnect the harness and pull out the reisitor, it'll have a gasket going around it to protect it from moisture and humudity. I have replaced 3 on my 1999, but the last one, I wrapped electrical tape around the exposed resistor. Might be luck, but this one has lasted me over 2 years now. While you have the panel dropped, I highly suggest chainging the air filter located there as well. Your AC will run more efficient.

Jan 24, 2011 | 1999 GMC Suburban

1 Answer

Fan blower stopped working on my 2006 yukon denali xl


check fuse,blower motor relay and blower resister(mounted in blower box) and blower motor

Jun 28, 2009 | 2006 GMC Yukon Xl Denali

1 Answer

1999 yukon denali blower motor not working


Check the dash fan control switch. It can be purchased separate from the whole cluster for under twenty dollars. The instrument panel cover comes off gently by hand with the tilt steering in the down position. You have to then unplug the electrical plugs to get it out of the way. The heater ac control panel then comes out by hand far enough to unscrew the heater fan control from the back. Auto Zone may have this part and have the step by step instruction to get the job done if needed. Good luck and hope this helps, if the fuse and relay is good, then it's going to be the switch. Keep me posted, be glad to help. 

Jun 27, 2009 | 1999 GMC Yukon Denali

3 Answers

1999 yukon denali no ac or heat blowing


chk the fan speed resistors mounted in the fan housing. You should be able to see the wires going into the box with 2 screws holding the resistors in place. Good Luck.

May 30, 2009 | 1999 GMC Suburban

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